Question

copper exists as a mixture of two isotopes. Copper is 69.17% abundant and it has a mass of 62.9296 amu. Copper-65 is 30.83% abundant and it has a mass of 64.9278 amu. Calculate the atomic mass of copper

Answer 1

The atomic mass of copper that exists as a mixture of two isotopes is 63.5456 amu

Let the 1st isotope be A

Let the 2nd isotope be B

From the question given above, the following data were obtained:

For A

Abundance of A (A%) = 69.17%

Mass of A = 62.9296 amu

For B

Abundance of B (B%) = 30.83%

Mass of B = 64.9278 amu

Atomic mass of copper =?

The atomic mass of the copper can be obtained as follow:

Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

= [(62.9296 × 69.17)/100] + [(64.9278 × 30.83)/100]

= 43.5284 + 20.0172

Atomic mass of copper = 63.5456 amu

Therefore, the atomic mass of copper is 63.5456 amu

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